Question

a uniform metre rule balance on a knife edge at the 55cm mark, when a mass of 40g is hung from the 95cm marks, find its weight of the ruler.

Answer 1

932@4566519292*!&!&&@

Answer 2

Let the weight of the ruler be X.
Now X acts in the middle, so we have 55-50 = 50cm
Since left hand movement= right hand movement
X(55-50)=90(95-55)
5X= 90×40
X=320cm
Hence the weight of the ruler is 320g